Pumping apparatus



Sept. 28, 1937. c. P. CADY PUMPING APPARATUS Filed Aug. 29, 1935INVENTOR (1107/65 1. ('a

Patented Sept. 28, 1937.

PUMPING PATENT OFFiC APPARATUS Charles P. (lady, Canastota, N. Y.,assignor to The Linley Corporation, Canastota, N. Y., a corporation ofNew York Application August 29, 1935, Serial No. 38,371

Claims.

This invention relates to compressing apparatus, and particularly tocompressing apparatus of the type which may be used as a pump for fluidsor as a fluid motor or meter.

Among the objects of the invention is to provide a compressing apparatussimple in construction, requiring no adjustment after assembling, havingfew moving parts, and otherwise designed for economy in manufacture.

Another object of the invention is to provide a fluid force pump capableof eflicient and noiseless operation and which incurs relativelylowexpense for its construction in compa ison with pumps of the samegeneral classification The apparatus embodying the present inve ionincludes a cylinder containing a rotor having expansible chambers whichare varied in size by pistons receiving oscillatory motion owing to therotation of the rotor. The oscillation of the pistons is accomplished bya pair of rockers which are guided upon sloping surfaces as the rotor isrotated, the rockers having curved bearing edges which engage grooves inthe pistons and cause complete oscillation of the pistons accompanied bya double intake and discharge impulse for each revolution of the rotor.The apparatus is characterized by the absence of contacting sphericalsurfaces and the use of cylindrical and planar surfaces for the rotorand pistons, thereby enabling close machining and accurate fitting ofthe moving parts in a manner conducive to obtaining reasonable operatingefficiency for a pump calling for relatively low manufacturing costs.

Other objects of the invention involving novel construction andcombinations of parts will appear in the specification and claimsthereof, setting forth what is now considered to be the best mode ofapplying the invention, which may be fully understood from the detaileddescription and drawing. In the drawing:

Fig. 1 is a vertical section taken transversely of the cylinder and axisof rotation of the rotor taken on line Ii of Fig. 2.

Fig. 2 is a vertical section on the axis of rotation of the rotor takenon line 2-2 of Fig. 1.

Fig. 3 is a section on line 33 of Fig. 1.

Fig. 4 is an end view of the apparatus with the end plate removed.

Fig. 5 is a perspective view of one of the pistons.

For clarity of disclosure I shall describe the invention with referenceto its use as a pump wherein the impelling parts are driven by powerapplied to the shaft and it will be understood. that as a meter or motorthe fluid forced against the impelling or moving parts cause actuationof the shaft. The pump comprises a cylinder containing the impellingparts including a rotor and pistons. The cylinder is in the form of acasing I 0 which may be cast in one piece, if desired, and suitablycored for the chambers and bore. It is provided with a pair of chambersll, l2, which are individually in open communication at their innersides with the cylinder bore except as intercepted by the cylindricalsurface of the rotor i3. Chambers II and I2 have connection with inletl4 and outlet l5, respectively, whose operating functions may bereversed, depending upon the direction of rotation of the rotor and theoperating cycle of the pistons.

The ends of the cylinder are closed by end members or cylinder platesl6, l1, which are similar and are held in place by screws Ill. I Gasketsl9 and are provided between finished surfaces of the end plates andcylinder casing. The cylinder plates are provided with bearings 2|, 22,for the 20 rotor shaft 23 to which may be aillxed a pulley, gearing orother mechanism for transmitting rotary motion to or from the shaft. Thebearings are keyed to the stationary end plates by some such means asset screws 24 so as to prevent their 25 rotation relative to thecylinder, for reasons which will appear hereinafter.

Rotor i3 is made up of a pair of members 25, '26, (Figs. 1 and 4), whichprovides. cylindrical bore 21 (Fig. 2) in which the pistons aredisposed. .30 The axis of the cylindrical bore2l within the rotor is .atright angles to the axis of rotation of the rotor so that pistons 28-and 29 are pivotaliy mounted to oscillate at right angles to the axis ofshaft 23 which carries the rotor. Fig..1'is a sectional elevation of thepump taken through the axis of oscillation of the pistons and shows theworking surfaces 30 and 3| of one of the pistons. The purpose of makingthe rotor in two parts is to provide a simple construction'wherebythe'40 interior of the rotor may be easily drilled and finished toprovide a cylindrical bore for accommodating the pistons 28 and 29, butthe rotor may be made up from two or more parts of differentconfiguration, if desired. As illustrated in Fig. 4, member 26 is in theform of a segment having a flat surface constituting one of the twoparallel walls of the piston chamber within the rotor. The two members25 and 26 may be secured together by dowel pins 32 or in any othermanner, as by 50 brazing or welding.

Each piston 28 and 29 is provided with a slot 33 which is soproportioned as to allow clearance for shaft 23 as the pistons arerocked. The outer contacting surfaces of the pistons are cylin therupperchamber between the working surfaces 30 of the two pistons is in acontracted condition, whereas the lower chamber between worinlngsurfaces 3! is in an expanded condition. ffne change from minimumcontracted condition to maximum expanded condition, and vice versa,occurs through of rotation of the rotor, as will be explainedhereinafter.

The oscillation of the pistons takes place about the enlargedbearingsurface of pin 35 which is itself mounted in a hole 31 drilled in therotor [3 (Fig. 1). The shoulder effect producedbythe enlarged portion ofthe bearing pin assures that there will be no longitudinal displacementof the 7 bearing pin relative to the rotor.- Pin 38 acts as a splinebetween shaft 23 and bearing pin 35, so that rotation of shaft 23 in itsbearings will carry with it the bearing pin and rotor 13, and it is afeature of this construction that the torque transmitted from shaft 23to rotor I3 is entirely independent of the free rocking action of thepistons on their'bearing pin 35 50 that no binding of the pistons canoccur. A screw 39 may belused as a plug for filling the hole drilled inthe end of the bearing pin for accommodating pin 38. Preferably, thehead end of this screw should-be ground to form a continuous surfacewith the exterior of rotor l3. Other ways of mounting the rotor forrotation of shaft 23 may be availed of, as, for example, the holes inthe two members 25 and 26 which constitute the rotor would not need toextendto the peripheral surface of the rotor, thereby eliminating thenecessity of using a plug similar to screw 39, They may be drilled fromthe sides of the piston bore sufliciently deep :for accommodating stubends of a piston bearing pin.

The inclinations of pistons 28.and.29 within the bore of rotor l3 arecontrolled by a pair of rockers or bridge members 40 and all and a pairof cams or inclined bearing surfaces. The two bridge members aresimilar. and one controls piston 28 and "the other controls piston 29.The" bridge portion 42 isprovided with a slot 43 for the passage ofshaft 23. The slot is sufliciently long to prevent interference betweenrockers and shaft. The outside surface of the bridge portion 42isflat'and bears against an anti-friction pad 36, which isself-lubricating and is mounted upon an inclined bearing surface 44.This surface is preferably formed from a part of the shaftbear ingll,and it is thereby maintained stationary with respect to the cylinder.The flanges of the rockers 40 and 4| are provided with ourvededges 45,46, (Fig. 4) whichfit into slots 41, 48 in the pistons (Fig. '5). Therockers, buttressed against and guided by the sloping surfaces, serve tooscillate the pistons upon bearing pin 35 as shaft 23 and rotor l3 arerotated. Rotation of the rotor and rockers about the axisof shaft 23causes the rocking members to slide transverslyyto shaft .23 and'at thesame time rock to transmit oscillatory motion to the pistons at rightangles to the axis of shaft23. The motion transmittedby the action'oftherockers and slopingsurfaces is universal in character, causingrocking of the pistons on one axis while the axisis being rotated aboutanother-axis at right angles thereto.

As previously described, there are two working walls 30 and 3| to eachpiston and these are complemental to each other so that when the pistonsare rocked, the upper pair of walls so of the pistons approach each.other for one half revolution of shaft 23, and retract from each otherfor the other half revolution of rotation of shaft 255.

as shown Fig. 2, the upper walls of the pistons are in their closestposition or" approach, where as the lower waits are in their mostseparated position. As shaftZii is rotated in a countercloclzwisedirection, Fig. i, the upperwalls are gradually separated from eachother, thereby causing them to draw in fiuid from chamber II. This fluidenters through port 49 in the rotor and into the expanding chamber orspace provided by the separating action of opposite walls of thepistons.

While this is happening, the lower pair of walls 3| of the pistons arebeing forced towards each other and the fluid .contained therebetween isi being expelled through port 50 andinto chamber A IL The two'variablechambers or spaces between the pistons, includingas part thereof ports49 and 50, are varied from minimum to maximum for each half rotation ofshaft 23, so that two pumping operations are completed for eachrevolution of shaft 23. "It will be understood that the rotor, j

shaft 23 may be rotated in either direction for changing the inlet andoutlet of the pump. Also,

that without changing the direction of rotation, of the rotor shaft, theinlet and outlet, of the pump, or the direction of fluidlflow to andfrom the pump may be changed by reversing the inclination of bearingsurfaceslk. This maybe accomplished by displacing these bearing surfacesthrough 180 by inverting the fixed relationship of theend plates inrespect to thecylinder.

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While the apparatus is admirably suited for use 7 as a force feed pumpfor liquids it will be understood that its use is not'limited to anyparticular fluids or gases, or either as acompressing or v exhaustapparatus, motor or meter.

What is claimed isz' i 1. In combination; a cylinder having 9.cylindrical bore and inlet and outlet ports individually communicatingwith the bore, a rotor mounted for rotation in'said bore, said rotoralso having -a cylindrical bore, theaxis of the rotor bore being in theplane of, the axis of said first named bore and at right angles,thereto, a pair of pistons mounted for. oscillation within the bore ofsaid rotor, said, pistons; providing variable chambers, rocker means andcams for causing universaljmotion of. said pistons resulting fromoscillation of thepistonson their own axis and rotation'with the rotoriabout the rotor axis of rotation, and means for rotating said rotor forbringing the variablechambrs into periodic jreg-f istration with theinlet and outlet ports.

2. In combination, a cylinder having 2. Gym:

drical bore and inlet and outlet ports individually, V communicatingwith the bore, a rotor mounted for rotation in said bore,withitsperipheralsurface in operating contact with the cylindrical wallof said bore, said peripheral surface having portions adjacent saidinlet and outlet ports during rotation of the rotor, said rotor having acylinpiston means mounted for oscillation in the bore drical boretherein angularly disposed at'right .anglesin respect to the bore ofsaid cylinder,

of said rotor for varying the size of chambers within thebore ofsaidrotor, each of. said chambers being provided. with a passage therefromand through theperipheral surface of the rotor for periodicallycommunicating its associated chamber with said inlet and outlet portsupon rotation of the rotor, and means for oscillating said pistons totake in and expel fluid from the variable chambers from and tosaid-inlet and outlet ports as said rotor is rotated.

3. In combination, a cylinder having a cylindrical bore and inlet andoutlet ports individually communicating with the bore, a rotor mountedfor rotation in bearings in said cylinder, pistons within said rotor,said pistons being disposed in a bore in said rotor which is at rightangles to the axis of said first named bore, a bearing pin mounting saidpistons for rocking movement in respect to said rotor, cams carried bysaid cylinder, and rocking means carried by said rotor and pistons forrocking said pistons by engagement with said cams as the rotor rotates,said rotor having ports in constant communication with the workingsurfacesof said pistons for enabling periodic communication with saidinlet and outlet ports as the rotor rotates.

4. In combination, a cylinder, a rotor mounted therein, pistons mountedin said rotor for oscillation at right angles to the axis of saidcylinder and rotor, said pistons providing variable chambers in saidrotor by their oscillation, means for oscillating said pistons, saidmeans including sloping surfaces and rockers cooperating therewith andwith said pistons for oscillating said pistons upon rotation of saidrotor and pistons in respect to the sloping surfaces, said cylinderhaving chambers separate from one another with which the variablechambers are periodically registered as the rotor is rotated.

5. In combination, a cylinder having a bore and inlet and outlet portsopening into said bore, a rotor mounted for rotation in said bore withits peripheral surface in operating contact with the cylindrical wall ofsaid bore, said peripheral surface having portions adjacent said inletand outlet ports during rotation of the rotor, said rotor also having abore therein, the rotor bore being angularly disposed at right angles inrespect to the bore oifi said cylinder, a pair of pistons mounted foroscillation within the bore 01 said rotor-for providing variablechambers, each of said chambers being provided with a passage therefromand through the peripheral surface of the rotor for periodicallycommunicating its associated chamber with said inlet and outlet portsupon rotation of the rotor, means for oscillating said pistons on theirown axes as they are rotated with the rotor about the axis of rotationof the rotor, and means for rotating said rotor for bringing thevariable chambers into periodic registration with the inlet and outletports.

CHARLES P. CADY.

